ecnrypt-rijndael-128

const mCrypt = require('mcrypt').MCrypt

/*
 *encrypt police vehicle no
 *encrypt with algorithm rijndael-128, cbc
 *random key
 */

function encrypt(value) {
    const theKey = getKey()
    const iv = '7yR83bkw5rpOGR4m'
    const encryptPoliceNo = new mCrypt('rijndael-128', 'cbc')
    encryptPoliceNo.validateKeySize(false)
    encryptPoliceNo.validateIvSize(false)
    encryptPoliceNo.open(theKey, iv)

    const cipherText = encryptPoliceNo.encrypt(value)
    const buf = Buffer.from(cipherText, 'utf8').toString('hex')
    return buf
}

function getKey() {
    const keyLength = 16
    const chars = '1234567890abcdefghijklmnopqrstuvwxyz'

    if (keyLength > 0) {
        const charLength = chars.length - 1
        let theKey = ''
        for (let idx = 1; idx < keyLength; idx = theKey.length) {
            theKey += chars.charAt(Math.floor(Math.random() * charLength))
        }

        return theKey
    }
}